In the experiment, the variable is the time taken for the water to boil and the dependent upon the amount of salt added to the solution. Thus, the correct option is A.
What is the boiling point of water?
The boiling point of a substance is the temperature at which the vapor pressure of a liquid is equal to the pressure surrounding the liquid and the liquid changes into a vapor into the atmosphere.
The boiling point of a liquid varies depending upon the surrounding environmental pressure of the liquid. A liquid in a partial vacuum has a lower boiling point than the liquid at atmospheric pressure.
By adding a substance in a pure water sample, the boiling temperature of the pure water is elevated. In this experiment, the dependent variable is the amount of time it takes for the water to boil and the variable is dependent because it is dependent on the amount of salt added to the water sample.
Therefore, the correct option is A.
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What type of coal has the highest carbon content? 1.Sub-bituminous coal 2.Bituminous coal 3.Anthracite coal
Answer:
Anthracite coal contains the highest carbon content.
Which option is part of designing a set of experimental procedures?
A. Using instruments to gather data
B. Analyzing the data gathered
C. Developing conclusions based on the data
D. Identifying the types of data to be gathered
The option which is part of designing a set of experimental procedures is: D. Identifying the types of data to be gathered.
In Science (Physics), an experiment is a systematic investigation carried out under controlled conditions and it typically involves a researcher or scientist manipulating an independent variable (the cause), in order for the researcher or scientist to determine and measure the dependent variable (the effect) through series of observation.
Experimental design refers to the creation of a set of experimental procedures in order to systematically test a hypothesis.
Generally, there are five (5) main steps in designing an experiment and these include:
Defining and identifying the types of data (variables).Writing a specific and testable hypothesis.Designing the experimental treatments.Assigning subjects to treatment groups.Measuring your dependent variable.In conclusion, identifying the types of data to be gathered is part of designing a set of experimental procedures.
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In the periodic table, the most reactive metals are found a. in Group 1, the first column on the left. b. in Period 1, the first row across the top. c. in Groups 13 through 16 in the center. d. in Periods 6 and 7 at the bottom.
Answer:
Group 1
Explanation:
The alkali metals are the most reactive metals found on the periodic table
In a periodic table, the most reactive metals are found in Group 1, the first column on the left. (option a)
The most reactive metals are found in Group 1, which is the first column on the left side of the periodic table. Group 1 is also known as the alkali metals. These metals include elements like lithium (Li), sodium (Na), and potassium (K). Alkali metals are highly reactive because they have only one electron in their outermost energy level.
This means they are eager to lose that electron and achieve a stable electron configuration, which makes them more likely to engage in chemical reactions.
As we move down Group 1, the reactivity increases because the outermost electron is farther from the positively charged nucleus, making it easier to lose.
Hence the correct option is (a).
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The forced exerted on an object are shown. If the object moves right, which of the following is a possible value of F? Ignore my answer please help.
Answer:
5N
Explanation:
Because if it moves to the right, that means F is weak and 6N is STRONK
The evaporation of water is an example of a change in what?
Why was the microscope and its improvement an important part of the development of the cell theory?
Answer:it’s is part of the cell theory because they where studying cells and to see it you need a microscope
Explanation:basically in the answer area
Make a list of twenty things in your home that are things you need. These should be things related to supplying you with warmth, food, and shelter
Answer: If in some sort of survival situation this might be of some help if its not then im not sure
1. Fire starter it is always handy to keep some sort of object that can help with warmth like a lighter matches or flint
2. A first aid kit would also be extremely helpful in case of injury it carries multiple different types of ways to clean a wound and bandage it properly
3. a Compas map or some sort of navigational device would be helpful in case you got lost
4. A phone or any way of communication would be helpful
5. Layers of clothing would be great or some sort of clothing fit for the climate you are in warm insalated clothing for winter and light clothing for heat
6. Rope or cords can be used for many things in the wild much like traps keeping your items or food off of the ground at out of the reach of animals
7. Water carrier and or any sort of water filtration device it is best to keep you from getting dehydrated.
8. A light source like a flashlight
9. Bug spray most insects can carry diseases like mosquitos and malaria
10. Any sort of survival knife bone saw or machete anything that can cut up animals or wooded areas are very helpful
11. Blankets they are very useful in keeping you warm out in the elements
12. Tarps they are best at keeping things dry
13. Batteries and charging devices are also very helpful
14. weapons like guns bow and arrows or knives are also useful
15. Burnable materials like paper cloth and such are useful for starting fires
16. meat is a very good source of protein and can be used to help keep the calorie intake for your body steady
17. berries are good for the sugar intake and as well as the jucie and water stored inside
18. beans are highly nutriocis they hold calcium and iron and can be dried up and stored for later needs
19. Fish it has omega-3 fatty acids which are healthy for your heart and it is high in vitamin b-12
20. oats they lower cholesterol levels and carries essential vitamins needed to keep the body healthy
A red blood cell has a diameter of approximately 8 micrometers, or 0.008 um.
A model represents its diameter as 8 um. What is the ratio of model size to
actual size?
O A. 1:1,000
B. 1:100
O C. 100:1
OD. 1,000:1
thank youuuuu
A red blood cell has a diameter of approximately 8 micrometers, or 0.008 um. if a model represents its diameter as 8 um.
The ratio of the model size to the actual size would be
What is a unit of measurement?
A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
As given in the problem a red blood cell has a diameter of approximately 8 micrometers, or 0.008 um. if a model represents its diameter as 8 um.
Size of the model /actual size = 8 /.008
=1000: 1
Thus, the correct answer is option D.
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What is a unit for gas particle pressure? (Choose all that apply)
torr
kPa
mm Hg
atm
Answer:
The SI unit of pressure is the pascal (Pa), which is equal to one Newton per meter squared (N/m2).
Explanation:
Answer:
All of them are correct
Explanation:
What is the name of the system that standardizes measurements in science
Explanation:
the international system of unit of the aside from the branch system International is a unit is is the metric system used in Sin industries and medicine
Answer:
Metric system
Explanation:
Also known as SI system
During a hot shower, water vapor fogs up the cooler mirror when it turns to water. This is an example of ____. A) condensation b) deposition c) sublimation d) vaporization
A) condensation
Condensation is the transformation of a gaseous state into a liquid one, and it is the inverse of vaporization. The term is most commonly used to describe the water cycle.
Deposition is a phase transition in which a gas becomes a solid without first passing through the liquid phase.
Sublimation is the process of converting a solid to a gaseous state without it being liquid.
Vaporization of an element or compound is a phase transition from the liquid phase to vapor.
Therefore, During a hot shower, water vapor fogs up the cooler mirror when it turns to water. This is an example of A) condensation
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What are fossil fuels composed of? 1.Carbon 2.Nitrogen 3.Oxygen
Answer:
fossil fuels are composed of Carbon.
Answer: Carbon
Explanation:
Which illustration represents high accuracy but low precision?
plz help
The first illustration represents high accuracy but low precision, therefore the correct answer for the given problem is option A.
What is accuracy?The degree to which a measurement is accurate in relation to its true value. The degree to which the same results are produced by repeated measurements under the same circumstances is known as precision.
Scientists think of errors in terms of precision and accuracy. How accurately a measurement reflects how close it is to the actual or acceptable value. Precision is the degree to which measurements of the same thing concur with one another.
The first illustration represents high accuracy but low precision
The second illustration represents high accuracy but high precision
The third illustration represents low accuracy but high precision
The fourth illustration represents low accuracy but low precision
Thus, The first illustration represents high accuracy but low precision, therefore the correct answer for the given problem is option A.
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What is the relationship between an experiment and a hypothesis?
A. An experiment should be designed so that the hypothesis is
proven to be true.
B. A well-designed experiment is one that can test a number of
different hypotheses.
O C. A useful hypothesis is one that can guide the design of an
experiment.
O D. A hypothesis is an educated guess as to the outcome of an
experiment.
A useful hypothesis is one that can guide the design of an experiment. The correct option is C.
What are an experiment and hypothesis?It is possible to create fresh hypotheses and experiments that more closely match the results of the initial studies' observations. A hypothesis is formulated to explain an observation, and an experiment is created to test it. The experiment's findings might or might not support the hypothesis.
Negative results do not necessarily imply that the hypothesis is invalid. It implies that there must be another connection between the variables. To accomplish this, a new theory and experiment must be created in order to better account for the observations.
Therefore, a useful hypothesis is one that can guide the design of an experiment. The correct option is C.
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How can removing thermal energy afect the state of matter? (Check all that apply)
a). When thermal energy is removed from water vapor the temperature decreases and condensation can occur.
b).When thermal energy is removed from a liquid the particles slow down and a water vapor is formed.
c). When thermal energy is removed from a liquid the temperature decreases, the particles slow down, and freezing occurs forming a solid.
d). When thermal energy is removed from water vapor the particles slow down and evaporation occurs.
What has to happen for these atoms/molecules to change from one state of matter to another? *view attachment*
Answer:Thermal energy is added or transferred
Explanation:
How can positive feedback influence the behavior of a system?
A. It can cause the system to maintain a constant output.
B. It can cause the system to decrease its input more and more.
C. It can cause the system to increase its output more and more.
D. It can cause the system to more efficiently convert inputs into
outputs.
Answer:Its C
Explanation:
Positive influence will always increase its output more and more as it increases
Think about a real rocket launching at NASA. What are the action and reaction forces in the launch? Which forces do these action-reaction forces act against? (gravity? Normal force?)
Answer:
whats the question???
Explanation:
Answer:
the force is the fuel in the rocket that helps it lift off
Explanation:
What converts organic remains into fossil fuels? 1.chemical reaction 2.water 3.heat and pressure
Answer:
3. heat and pressure
Explanation:
Answer:
3. Heat and Pressure converts organic remains into fossil fuels
For Science: A student is working on an experiment that requires her to measure the lengths of different tubes. The student records the lengths in the following table.
Tube # Length
Tube 1: 45 centimeters, Tube 2: 22 centimeters, Tube 3: 12 inches, Tube 4: 12 centimeters,
What is wrong with the student's table?
Which would increase the rate of dissolving salt into water? low temperature little to no agitation more surface area darker colors
Answer:
the answer is more surface area
Explanation:
i took the quiz and got it right
More surface area will help to increase the rate of dissolving salt in water.
What is dissolution?Dissolution is a process in which a substance is dissolved totally in a solvent or water. It is a process solute dissolve in solvent.
Therefore, More surface area will help to increase the rate of dissolving salt in water.
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What property of matter takes up space
Answer:
Density
Amount of matter = mass
Amount of space it takes up = volume
Explanation:
Our data for how much force is needed can be qualitative. This means we don’t have to know exact values for the force in Newtons. Let’s use a scale of 1-5 to rank how much force we apply each time.
6. How many different masses should we use?
How many trials should we do for each mass?
Answer:
For macroscopic objects, we use units such as grams and kilograms to state their masses, but. There will not be much error if you estimate the mass of an atom by simply. to what we did for our hypothetical example, but the percentages are different: Add two atomic masses of carbon and six atomic masses of hydrogen:
Explanation:
A student is measuring the circumferences of pine trees for an experiment.
She measures 50 trees using a ruler that measures to the nearest centimeter.
Which statement describes a change that could help improve the results of
her experiment?
A. Her measurements will be more precise if she measures an
additional 50 trees.
B. Her measurements will be more accurate if she uses a cloth tape
measure instead of a ruler.
C. Her measurements will be more precise if she uses a cloth tape
measure instead of a ruler.
D. Her measurements will be more accurate if she measures an
additional 50 trees.
Answer:
B and C
Explanation:
The student's measurement would be more accurate if she can measure an additional 100 caterpillars and be more precise if she uses a ruler that measures to the nearest millimeter.
Accuracy refers to the closeness of measurement or group of measurements to the true value while precision is the closeness of repeated measurements.
The accuracy of a measurement is increased by increasing the number of sample measurements. The more the sample measurements, the lesser the deviation of the mean from the true value.
The precision of a measurement is increased by being able to measure small differences. Hence, a ruler that measures to the nearest millimeter would be more precise than a ruler that can only measure in centimeter.
The correct option is B and C.
Answer:
Explanation: her measurement will be more accurate if she uses a cloth tape measure instead of a ruler
Think about a real rocket launching at NASA. What are the action and reaction forces in the launch? Which forces do these action-reaction forces act against?
A parking lot is going to be 40 m wide and 100 m long. Which dimensions
could be used for a scale model of the lot?
A. 10 cm x 25 cm
B. 100 cm x 300 m
O C. 75 in x 225 cm
D. 25 cm x 75 cm
Matter is all around us and is made of atoms. How are atoms of different elements different from each other? How do these differences relate to their properties? HEYALPPP
What converts organic remains into fossil fuels? 1.chemical reaction 2water 3.heat and pressure
Answer:
Heat and pressure
Explanation:
Help please! Science!
Answer:
My best guess is B. Sorry if I couldn't be of more help but that is the most likely answer.
My request: Please leave a follow, it would help a lot!
The forces exerted on an object are shown. A box has an arrow pointing right labeled F shown and an arrow pointing left labeled 8 N. If the object moves left, which statement is correct about force F?
Answer:
force F is weaker than force N
Answer:
its less then 8 N :)